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The following content is provided under a Creative Commons license. Your support will help MIT OpenCourseWare continue to offer high quality educational resources for free. To make a donation or to view additional materials from hundreds of MIT courses, visit MIT OpenCourseWare at ocw.mit.edu. PROFESSOR: All right, guys. So letamp;#39;s get started. Welcome back from what I hope was an exciting holiday for everyone. So today weamp;#39;re going to talk about user authentication. So the basic challenge that we want to address today is how can human users prove their identity to a program? In particular, the paper that was assigned for todayamp;#39;s class addresses an existential question in the security community. Is there anything better than passwords for authentication? So at a high level it seems like passwords are a terrible idea. So they have very low entropy, its very easy for attackers to guess them. Also the security questions that we use to recover from lost passwords often